<template>
  <div>
      <h1>v-on练习</h1>
      <h3>{{msg}}</h3>
      <button @click="fn">反转</button>
  </div>
</template>

<script>
export default {
data() {
    return {
        msg:'hello world'
    }
},
methods : {

    fn() {
        this.msg=this.msg.split('').reverse().join('')
    }
}
}
</script>

<style>

</style>